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- adding unit 'u' (synonym for amu)
- adding units to the help file

    1: \label{Physical_Units}
    2: \section*{Physical Units Accepted by LON-CAPA}
    3: The following subsections show the physical units that LON-CAPA accepts. 
    4: The symbols must be used when entering the units, for example {}``35 kg''.
    5: \subsection*{Base Units}
    6: \begin{verbatim}
    7: # name      symbol     comment
    8: 
    9: meter           m      # length
   10: kilogram        kg     # mass
   11: second          s      # time
   12: ampere          A      # electric current
   13: kelvin          K      # thermodynamic temperature
   14: mole            mol    # amount of substance
   15: candela         cd     # luminous intensity
   16: \end{verbatim}
   17: \subsection*{Prefixes}
   18: \begin{verbatim}
   19: #   Prefix     symbol     factor
   20: 
   21: yotta            Y         10^{24}
   22: zetta            Z         10^{21}
   23: exa              E         10^{18}
   24: peta             P         10^{15}
   25: tera             T         10^{12}
   26: giga             G         10^9
   27: mega             M         10^6
   28: kilo             k         10^3
   29: hecto            h         10^2
   30: 
   31: deci             d         10^-1
   32: centi            c         10^-2
   33: milli            m         10^-3
   34: micro            u         10^-6
   35: nano             n         10^-9
   36: pico             p         10^{-12}
   37: femto            f         10^{-15}
   38: atto             a         10^{-18}
   39: zepto            z         10^{-21}
   40: yocto            y         10^{-24}
   41: \end{verbatim}
   42: \subsection*{Derived Units}
   43: \begin{verbatim}
   44: # Derived Unit
   45: # name       symbol    comment
   46: 
   47: gram            g      # mass
   48: hour            hr     # time
   49: minute          min    # time
   50: day             day    # time
   51: year            yr     # time
   52: pound           lb     # mass
   53: ounce           oz     # mass
   54: inch            in     # length
   55: foot            ft     # length
   56: mile            mi     # length
   57: yard            yd     # length
   58: nautical_mile   n_mi   # length, nautical mile (UK)
   59: rood            rood   # area, rood
   60: acre            acre   # area, acre
   61: hertz           Hz     # frequency
   62: litre           L      # volume
   63: newton          N      # force
   64: pound_force     lbf    # force
   65: dyne            dyn    # force
   66: pascal          Pa     # pressure, stress
   67: bar             bar    # pressure
   68: mmHg            mmHg   # pressure, millimeter of mercury
   69: torr            torr   # pressure
   70: atm             atm    # standard atmosphere
   71: joule           J      # energy, work, heat
   72: electronvolt    eV     # energy
   73: calorie         cal    # energy
   74: Btu             Btu    # energy
   75: watt            W      # power, radiant flux
   76: coulomb         C      # electric charge
   77: volt            V      # electric potential, electromotive force
   78: ohm             ohm    # electric resistance, use this in /ANS
   79: ohm             ohms   # electric resistance
   80: ohm             Ohm    # electric resistance
   81: ohm             Ohms   # electric resistance
   82: siemens         S      # electric conductance
   83: farad           F      # electric capacitance
   84: tesla           T      # magnetic flux density
   85: weber           Wb     # magnetic flux
   86: henry           H      # inductance
   87: radian          rad    # plane angle
   88: degree          deg    # plane angle (Pi rad=180 deg)
   89: steradian       sr     # solid angle
   90: lumen           lm     # luminous flux
   91: lux             lx     # illuminance
   92: becquerel       Bq     # activity (radioactive)
   93: gray            Gy     # absorbed dose (of radiation)
   94: sievert         Sv     # dose equivalent (dose equivalent index)
   95: astroUnit       AU     # mean distance earth to sun
   96: celcius         degC   # multiplicatively OK
   97: farenheight     degF   # multiplicatively OK
   98: molarity        M      # chemisty
   99: amu             amu    # atomic mass unit
  100: amu             u      # atomic mass unit
  101: \end{verbatim}
  102: \subsection*{Interpretation}
  103: The coded units are interpreted in the order of basic unit, 
  104: derived unit, then prefix. For example, ``T'' will be matched against 
  105: ``tesla'' instead of considered the prefix ``T''. Another example is that 
  106: ``min'' will match
  107: ``minutes'' instead of treated  as a combination of the prefix ``m'' and units.